iPhone 4 (4.0.2) Downgarding problem

My story:
I bought iPhone 4 some time ago with iOS 4.0 on the board.
The phone was arleady jailbroken and had ultrasn0w BUT "make my life easier" button wasn't pressed until Wednesday 25 September.

This is my first iPhone ever so I didn't know that after jailbreak I can't clear my all settings but I did. It was stupid, now I know.
After that I couldn't strart device and all I saw was boot screen with Apple logo. I was trying to upload 4.0 software once again using recovery mode but it didn't work. My last chance was to insall 4.0.2 and then try to downgarde to 4.0 or 4.0.1 and after that try install cydia with hope that SHSH file was backed up.
I installed 4.0.2 successufully but I couldn't downgrade manually to 4.0.1 or even 4.0. I had an popup error 3194 when trying to install older firmware. I' ve put also saurik's server sdress at the bottom of "hosts" file but no success.